* Values are calculated for Length of engagement of 5xPitch. ![]() The drill size chart contains tools up to 1. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.682 - 0.696 17.323 - 17.678 D 2 Pitch Diameter 0.7094 - 0.7153 18.019 - 18.169 D Major Diameter 0.7500 (Min) 19.05 (Min) α Varation of 30° anngle (+/-) 1 (Ref) 25.4 (Ref) P Varation of Pitch (+/-) 0.0017 (Ref) 0.043 (Ref) The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from 107 to 1 and then continues from A to Z. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.7406 - 0.75 18.811 - 19.05 d 2 Pitch Diameter 0.706 - 0.7094 17.932 - 18.019 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator Before starting to cut threads, there are a few factors to know to guarantee correct cutting: Standard or metric: Screw sizes come in two classifications: standard and metric. * Values are calculated for Length of engagement of 5xPitch. A tap drill chart determines what size hole to drill before tapping female threads and what size pipe is needed for male threads.
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